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HA error: "The number of heartbeat datastores for host is 1, which is less than required: 2" (2004739)

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Symptoms

  • The datastore is not accessible by all hosts.
  • The number of shared datastores between all hosts is less than 2.
  • While implementing a vSphere High Availability (HA) configuration, you see this error on one of the ESXi 5.x and above hosts:

    The number of heartbeat datastores for host is 1, which is less than required: 2

    The number of heartbeat datastores for host is 0, which is less than required: 2

Purpose

 To resolve the The number of heartbeat datastores for host is 1, which is less than required: 2 error, add a secondary heartbeat datastore.

Cause

This issue occurs if there is no redundancy in shared storage to allow for datastore heartbeating. As of vSphere 5.0, vSphere HA requires a minimum of two shared datastores shared between all hosts in a cluster for proper datastore heartbeat detection to function.

Resolution

To resolve this issue, add a secondary heartbeat datastore.

For more information, see the Datastore Heartbeating section in the: 
Warning: This workaround suppresses the error which reports the configuration having insufficient heartbeat datastores. 
 
To disable the HA error message:
  1. Log in to vCenter Server.
  2. Right-click the cluster and click Edit Settings.
  3. Click vSphere HA > Advanced Options.
  4. Under Option, add an entry for das.ignoreInsufficientHbDatastore.
  5. Under Value, type true.
  6. Click Cluster Features.
  7. De-select Turn on vSphere HA and click OK.
  8. Wait for all the hosts in the cluster to deconfigure HA, then right-click the cluster and click Edit Settings.
  9. Click Cluster Features.
  10. Click Turn on vSphere HA.
  11. Click OK

Impact/Risks

If the HA error message is disabled, there is no notification of the lack of redundancy for datastore heartbeat.

See Also

Update History

10/26/2011 - Added multiple steps under resolution to reflect turning on and off VMware HA based on TSE feedback

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